Update islandora_book_reader.js

Change image format from PNG to JPEG
Merge pull request #52 from giancarlobi/patch-1

Update islandora_book_reader.js
Use our own custom collapse.js to deal with IABR misuse of the URL anchor.
Merge pull request #53 from nigelgbanks/7.x-Collapsible-Fieldsets

Use our own custom collapse.js to deal with IABR misuse of the URL ancho...
Version bump for 7.x-1.3